OR is/was a supertrucker that overestimated his driving skills and was driving too fast for the road conditions.

Well..... what WERE the road conditions?

Besides.... no self respecting SuperTrucker would be in the right lane! :lol:

Super-Duper Trucker - he was passing everyone from the right shoulder.

Very often, if you get off the road surface onto the shoulder of the road, you'll find some kind of ridge or ledge when trying to get back onto the road. The proper thing to do, if you have this happen (especially in winter), is to slow down before you try to get back onto the road surface. That little "ledge" may only be about 1/4 inch or so, but it's enough to keep the steer on the shoulder, even with the pavement only wet. You can feel that the truck is not responding to a slight turn of the wheel. If you maintain speed, and turn the wheel more, you end up over-steering. What you see in the video is about exactly what can happen. Once that steer "jumps" up that ledge, you've already steered beyond control. Slowing the vehicle down doesn't give it the momentum to continue across the road like that. No, I can't say that's what happened. Snow on the ground, and the road looks wet, it's also possible that there was a patch of ice the driver was not prepared for. But, I would expect that to cause a jackknife. This rig stayed in line when it went out of control. The difference in height between the road surface and the shoulder seems far more likely.